We have studied the electrical conductance in Au nanowire containing 0.07 at.%Fe ions (AuFe nanowire) with mechanically controllable break junction technique to investigate the magnetic impurity effects in the atomic-sized conductance. At room temperature, we observe not only conductance steps at the integer multiples of G0 = 2e2/h, but also steps deviating from them in AuFe nanowire. Moreover, these features persist down to T=4.2 K. The scattering between the conduction electrons and Fe magnetic ions may lift the spin degeneracy of the transmission probability, which is responsible for the deviation. Zero bias anomaly is observed in the AuFe nanowire with the contact diameter larger than ∼3 nm in the current-voltage (I-V) measurements at T=4.2 K, which may be caused by Kondo effect.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)